PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

845-2445066 PIECE 18Seat,valve

Naval Ship Systems Command · NSN 4820-01-161-0932 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-161-0932 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-161-0932. Primary manufacturer part number: 845-2445066 PIECE 18.
Features
  • Seat,valve — FSC 4820
  • Flange Seat to Disk End Height: 0.750 INCHES NOMINAL IN
  • Thread Class: 2A SINGLE THREADED PORTION A
  • Material: NICKEL ALLOY OVERALL
  • Style Designator: THREADED FLANGED
  • Thread Series Designator: UNS SINGLE THREADED PORTION
  • Body Inside Diameter: 3.505 INCHES NOMINAL IN
  • Seat Angle in Deg: 60.000 NOMINAL
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Nickel Alloy Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-161-0932, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Ship Systems Command. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-161-0932
Primary Part Number845-2445066 PIECE 18
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerNaval Ship Systems Command
StatusACTIVE
Flange Seat to Disk End Height0.750 INCHES NOMINAL IN
Thread Class2A SINGLE THREADED PORTION A
MaterialNICKEL ALLOY OVERALL
Style DesignatorTHREADED FLANGED
Thread Series DesignatorUNS SINGLE THREADED PORTION
Body Inside Diameter3.505 INCHES NOMINAL IN
Seat Angle in Deg60.000 NOMINAL
Nominal Thread Size4.500 INCHES SINGLE THREADED PORTION IN
Under Flange Height0.875 INCHES NOMINAL IN
Flange Diameter4.910 INCHES NOMINAL IN
Thread Quantity Per Inch11-1/2 SINGLE THREADED PORTION
Seating Surface ShapeANGULAR
Thread Length0.750 INCHES NOMINAL SINGLE THREADED PORTION IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4820-00-900-234426M77-100 ITEM 19 INTERCHANGEABLE
Disk,valve
Naval Ship Systems Command
4820-01-092-034326M77-100 ITEM 21 INTERCHANGEABLE
Retainer,disk,valve
Naval Ship Systems Command
4820-01-121-29032620-920X12 PIECE 53 3IN INTERCHANGEABLE
Adapter,splined,globe Valve
Hydro-Aire Aerospace Corp
4320-01-148-830526M77-100 ITEM90 INTERCHANGEABLE
Ring,wearing
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-151-380826M77-100 ITEM 94 INTERCHANGEABLE
Guide,valve Stem
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-159-777726M77-100 ITEM 31 INTERCHANGEABLE
Disk Retainer and Throttling Ski
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-160-160426M77-100 ITEM 93 INTERCHANGEABLE
Guide,valve Stem
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-161-519026M77-100 PIECE 20 INTERCHANGEABLE
Disk,valve
Electric Boat Corporation Div General Dynamics Electric Boat
3020-01-190-616326M77-100 PIECE 55 4IN INTERCHANGEABLE
Gear,bevel
Electric Boat Corporation Div General Dynamics Electric Boat
5340-01-199-808326M77-100 ITEM 70 INTERCHANGEABLE
Plunger,detent
Electric Boat Corporation Div General Dynamics Electric Boat
Cross-Reference Index
Part NumberManufacturer
26M77-100 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-2445066 PIECE 18 PRIMARY Naval Ship Systems Command (USA)
26M77-100 PIECE 18 PRIMARY Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-2445066 Naval Ship Systems Command (USA)
Related Parts
4820-00-900-2344INTERCHANGEABLE
DISK,VALVE
26M77-100 ITEM 19
4820-01-092-0343INTERCHANGEABLE
RETAINER,DISK,VALVE
26M77-100 ITEM 21
4820-01-121-2903INTERCHANGEABLE
ADAPTER,SPLINED,GLOBE VALVE
2620-920X12 PIECE 53 3IN
4320-01-148-8305INTERCHANGEABLE
RING,WEARING
26M77-100 ITEM90
4820-01-151-3808INTERCHANGEABLE
GUIDE,VALVE STEM
26M77-100 ITEM 94
4820-01-159-7777INTERCHANGEABLE
DISK RETAINER AND THROTTLING SKI
26M77-100 ITEM 31
4820-01-160-1604INTERCHANGEABLE
GUIDE,VALVE STEM
26M77-100 ITEM 93
4820-01-161-5190INTERCHANGEABLE
DISK,VALVE
26M77-100 PIECE 20
3020-01-190-6163INTERCHANGEABLE
GEAR,BEVEL
26M77-100 PIECE 55 4IN
5340-01-199-8083INTERCHANGEABLE
PLUNGER,DETENT
26M77-100 ITEM 70
3020-01-212-0328INTERCHANGEABLE
GEAR SET,BEVEL,MATCHED
845-2445066 ITEM 55,66
4820-01-216-9271INTERCHANGEABLE
DISK STEM RING,VALV
26N77-100 ITEM 28

Frequently Asked Questions

What is NSN 4820-01-161-0932?

NSN 4820-01-161-0932 is a Seat,valve, manufactured by Naval Ship Systems Command, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-161-0932?

NSN 4820-01-161-0932 has 4 cross-referenced part numbers: 26M77-100 (Electric Boat Corporation Div General Dynamics Electric Boat), 845-2445066 PIECE 18 (Naval Ship Systems Command), 26M77-100 PIECE 18 (Electric Boat Corporation Div General Dynamics Electric Boat), 845-2445066 (Naval Ship Systems Command).

What NSN replaces 4820-01-161-0932?

There are 12 known substitutes for 4820-01-161-0932: 4820-00-900-2344, 4820-01-092-0343, 4820-01-121-2903 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 845-2445066 PIECE 18?

Key specifications for 845-2445066 PIECE 18: Flange Seat to Disk End Height: 0.750 INCHES NOMINAL IN; Thread Class: 2A SINGLE THREADED PORTION A; Material: NICKEL ALLOY OVERALL; Style Designator: THREADED FLANGED. 13 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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